EP1733042B1 - Chemo-enzymatic process for preparing escitalopram - Google Patents

Chemo-enzymatic process for preparing escitalopram Download PDF

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Publication number
EP1733042B1
EP1733042B1 EP05718505A EP05718505A EP1733042B1 EP 1733042 B1 EP1733042 B1 EP 1733042B1 EP 05718505 A EP05718505 A EP 05718505A EP 05718505 A EP05718505 A EP 05718505A EP 1733042 B1 EP1733042 B1 EP 1733042B1
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EP
European Patent Office
Prior art keywords
process according
formula
compound
benzonitrile
escitalopram
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP05718505A
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German (de)
English (en)
French (fr)
Other versions
EP1733042A1 (en
Inventor
Giovanni Cotticelli
Silvia Rocchietti
Marco Terreni
Massimo Pregnolato
Raul Salvetti
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Adorkem Technology SpA
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Adorkem Technology SpA
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Priority to SI200530329T priority Critical patent/SI1733042T1/sl
Priority to PL05718505T priority patent/PL1733042T3/pl
Publication of EP1733042A1 publication Critical patent/EP1733042A1/en
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Publication of EP1733042B1 publication Critical patent/EP1733042B1/en
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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P41/00—Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P41/00—Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture
    • C12P41/003—Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture by ester formation, lactone formation or the inverse reactions
    • C12P41/004—Processes using enzymes or microorganisms to separate optical isomers from a racemic mixture by ester formation, lactone formation or the inverse reactions by esterification of alcohol- or thiol groups in the enantiomers or the inverse reaction

Definitions

  • the present invention relates to a process for preparing enantiomerically pure 1-(3-dimethylaminopropyl)-1-(4'-fluorophenyl)-1,3-dihydroisobenzofuran-5-carbonitrile.
  • the above-mentioned compound whose structural formula is set out below, is a known active ingredient, better known as "citalopram", which is used for preparing pharmaceutical compositions which are intended for the treatment of depression.
  • citalopram Being provided with a chiral centre, citalopram is generally produced and marketed in the form of a racemic mixture.
  • EP347066 the S(+) enantiomer, better known as escitalopram, is responsible for practically the whole of the pharmacological activity of racemic citalopram.
  • European patent application EP347066 substantially describes two methods for preparing escitalopram.
  • the first method takes as a basis racemic 4-(4-dimethylamino)-1-(4'-fluorophenyl)-1-(hydroxybutyl)-3-(hydroxymethyl)benzonitrile which is subsequently esterified with an enantiomerically active acyl chloride, such as (+) or (-)- ⁇ -methoxy- ⁇ -trifluoromethylphenylacetyl chloride.
  • an enantiomerically active acyl chloride such as (+) or (-)- ⁇ -methoxy- ⁇ -trifluoromethylphenylacetyl chloride.
  • the second method takes as a basis enantiomerically (for example, (+)) pure 4-(4-dimethylamino)-1-(4'-fluorophenyl)-1-(hydroxybutyl)-3-(hydroxymethyl)benzonitrile.
  • the amine is salified with an enantiomerically active acid, such as, for example, tartaric acid, in order to provide two diastereoisomeric salts which can be separated by crystallization.
  • the pure enantiomer which is released from its salt is esterified to form a particularly labile ester (for example, with methane sulphonyl chloride) which, with the use of strong organic bases (for example, triethylamine), allows enantiomerically pure citalopram to be obtained.
  • a particularly labile ester for example, with methane sulphonyl chloride
  • strong organic bases for example, triethylamine
  • the process according to the present invention comprises resolution by the enzymatic route by means of an esterase from Aspergillus niger of the racemic mixture of a compound having formula I where R represents a C 1 -C 4 alkyl radical or an aryl radical in order to provide the corresponding (-) enantiomer having formula II.
  • esterases from Aspergillus niger are able to selectively hydrolyze solely the (+) enantiomer of the racemic mixture (I), thereby allowing the (-) enantiomer to be collected at high levels of yield and optical purity.
  • the (-) enantiomer obtained in this manner can therefore be converted by means of hydrolysis, preferably basic hydrolysis, into (-)4-(4-dimethylamino)-1-(4'-fluorophenyl)-1-(hydroxybutyl)-3-(hydroxymethyl)-benzonitrile having formula IV.
  • reaction diagram comprising both the resolution and the conversion into escitalopram, is set out in Figure 1 .
  • the racemic mixture of the compound having formula (I) can in turn be prepared according to methods known in the art.
  • EP-171943 describes a synthesis method which provides for two consecutive Grignard reactions on the basis of 5-cyanophthalide; the first with 4-fluorophenylmagnesium bromide and the second with 3-(dimethylamino)propylmagnesium chloride on the magnesium derivative obtained in this manner in order to obtain a magnesium intermediate which, following acid hydrolysis, brings the precursor of citalopram to the diol having formula I'.
  • This intermediate is then acylated selectively on the hydroxymethyl in position 3 (of the benzonitrile) according to the methods known in the art, for example, by reaction with the anhydride or the chloride of the corresponding acid.
  • 4-(4-dimethylamino)-1-(4'-fluorophenyl)-1-(hydroxybutyl)-3-(hydroxymethyl)-benzonitrile is acetylated on the hydroxymethyl residue by using acetyl chloride.
  • acetyl chloride preferably approximately 17 moles, per mole of starting product; the starting product is preferably added to the reaction medium whilst maintaining a preferred temperature of between 30 and 35°C; once the addition operations have been finished, the 4-(4-dimethylamino)-1-(4'-fluorophenyl)-1-(hydroxybutyl)-3-(acyloxymethyl) benzonitrile compound is readily isolated according to methods known in the art, for example, by evaporation at reduced pressure.
  • the resolution step is advantageously carried out in a solvent constituted by a mixture of an alcohol (preferably a C 1 -C 4 alcohol, and even more preferably MeOH) and water, preferably at a proportion of from 0.5-1.5 to 1, even more preferably at a proportion of 1 to 1, effected at a preferred temperature of from 15-35° C, preferably between 20 and 25°C.
  • a solvent constituted by a mixture of an alcohol (preferably a C 1 -C 4 alcohol, and even more preferably MeOH) and water, preferably at a proportion of from 0.5-1.5 to 1, even more preferably at a proportion of 1 to 1, effected at a preferred temperature of from 15-35° C, preferably between 20 and 25°C.
  • the water is advantageously used in the form of a phosphate buffer, preferably a monobasic potassium phosphate buffer.
  • the solvent is advantageously used at a quantity of from 3-5 litres, preferably from 3.5- 4 litres, per mole of substrate.
  • the racemic compound having formula I is initially added to the solvent at a basic pH value, preferably approximately 8, and is subsequently brought to a value of 6.
  • esterase enzyme from Aspergillus niger preferably immobilized on resin, generally epoxy resin (Eupergit C)
  • resin generally epoxy resin (Eupergit C)
  • the resolution reaction is monitored by means of HPLC and allowed to continue until a hydrolysis yield of 55% is reached, which level is normally reached after approximately from 70-80 hours; then, after filtration, extraction is carried out using ethyl acetate as the preferred solvent and, after subsequent evaporation and suitable crystallization using a mixture of diethyl ether/ethyl acetate, there is obtained solely the (-)4-(4-dimethylamino)-1-(4'-fluorophenyl)-1-(hydroxybutyl)-3-(acyloxymethyl) benzonitrile.
  • racemic mixture for the purposes of the present invention, the terms “racemic mixture”, “racemate” and “racemic compound” are intended to refer not only to a 50:50 mixture of the two individual enantiomers, but also a mixture in which one of the two enantiomers is present in excess with respect to the remaining enantiomer.
  • the pH was then brought to 6 by carrying out suitable modifications with 2N HCl and compensating for the volume of HCl added with the same amount in ml of MeOH in order not to change the composition of the solution.
  • the temperature of the solution was controlled so as to be in the order of between 20 and 25°C.
  • esterase enzyme derivative which is obtained from crude lipase extract from Aspergillus niger and which was immobilized on epoxy resin, such as Eupergit C, according to conventional processes.
  • the reaction was carried out using an automatic titrator so as to keep the pH constant and was monitored by means of HPLC until a hydrolysis level of 55% (from 70-80 hours) was obtained, with which 99% e.e. was obtained.
  • the enzyme was filtered and washed with a minimum quantity of H 2 O-MeOH solution (from 5-10 ml).
  • reaction solution was caused to evaporate at reduced pressure and the aqueous phase, suitably basified to pH 8.5, was extracted with ethyl acetate (approximately 70 ml, 4 times) in the presence of NaCl (approximately 5g).

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Zoology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biotechnology (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Enzymes And Modification Thereof (AREA)
  • Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
EP05718505A 2004-04-09 2005-04-07 Chemo-enzymatic process for preparing escitalopram Not-in-force EP1733042B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
SI200530329T SI1733042T1 (sl) 2004-04-09 2005-04-07 Kemiäťno-encimatski postopek za pripravo escitaloprama
PL05718505T PL1733042T3 (pl) 2004-04-09 2005-04-07 Chemiczno-enzymatyczny sposób wytwarzania escytalopramu

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000717A ITMI20040717A1 (it) 2004-04-09 2004-04-09 Procedimento chemo-enzimatico per la preparazione dell'escitalopram
PCT/IB2005/001067 WO2005098018A1 (en) 2004-04-09 2005-04-07 Chemo-enzymatic process for preparing escitalopram

Publications (2)

Publication Number Publication Date
EP1733042A1 EP1733042A1 (en) 2006-12-20
EP1733042B1 true EP1733042B1 (en) 2008-05-14

Family

ID=34967756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05718505A Not-in-force EP1733042B1 (en) 2004-04-09 2005-04-07 Chemo-enzymatic process for preparing escitalopram

Country Status (17)

Country Link
US (1) US7470526B2 (ja)
EP (1) EP1733042B1 (ja)
JP (1) JP2007532106A (ja)
CN (1) CN1946854A (ja)
AT (1) ATE395429T1 (ja)
BR (1) BRPI0508808A (ja)
CA (1) CA2561888A1 (ja)
DE (1) DE602005006770D1 (ja)
DK (1) DK1733042T3 (ja)
ES (1) ES2308465T3 (ja)
HK (1) HK1101827A1 (ja)
IT (1) ITMI20040717A1 (ja)
MX (1) MXPA06011609A (ja)
PL (1) PL1733042T3 (ja)
PT (1) PT1733042E (ja)
SI (1) SI1733042T1 (ja)
WO (1) WO2005098018A1 (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITMI20041872A1 (it) * 2004-10-01 2005-01-01 Adorkem Technology Spa Processo per la preparazione di citalopram e di scitalopram
EP1736550A1 (en) * 2005-06-22 2006-12-27 Adorkem Technology SpA Chemoenzymatic process for the synthesis of escitalopram
JP6680690B2 (ja) * 2014-04-10 2020-04-15 アールイージー ライフ サイエンシズ リミテッド ライアビリティ カンパニー 有機化合物の半合成経路
JP6925258B2 (ja) 2014-07-18 2021-08-25 ジェノマティカ， インコーポレイテッド 脂肪ジオールの微生物による産生

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1526331A (en) 1976-01-14 1978-09-27 Kefalas As Phthalanes
GB8419963D0 (en) 1984-08-06 1984-09-12 Lundbeck & Co As H Intermediate compound and method
JPS62151196A (ja) * 1985-09-26 1987-07-06 Nitto Electric Ind Co Ltd ｌ−プロプラノロ−ルの生化学的分離法
GB8814057D0 (en) 1988-06-14 1988-07-20 Lundbeck & Co As H New enantiomers & their isolation
JP3097145B2 (ja) * 1991-02-27 2000-10-10 日産化学工業株式会社 コーリーラクトンジオールの光学分割方法
AU746665B2 (en) 1998-10-20 2002-05-02 H. Lundbeck A/S Method for the preparation of citalopram
PL355532A1 (en) 1999-12-28 2004-05-04 H.Lundbeck A/S Method for the preparation of citalopram
AR034612A1 (es) 2001-06-25 2004-03-03 Lundbeck & Co As H Proceso para la preparacion del citalopram racemico y/o del s- o r-citalopram mediante la separacion de una mezcla de r- y s-citalopram
AR034759A1 (es) 2001-07-13 2004-03-17 Lundbeck & Co As H Metodo para la preparacion de escitalopram
IS7239A (is) 2001-12-14 2004-04-29 H. Lundbeck A/S Aðferð til framleiðslu á essítalóprami
PE20040991A1 (es) * 2002-08-12 2004-12-27 Lundbeck & Co As H Separacion de intermediarios para la preparacion de escitalopram

Also Published As

Publication number Publication date
PL1733042T3 (pl) 2008-10-31
ES2308465T3 (es) 2008-12-01
MXPA06011609A (es) 2007-01-23
CA2561888A1 (en) 2005-10-20
JP2007532106A (ja) 2007-11-15
US7470526B2 (en) 2008-12-30
PT1733042E (pt) 2008-07-29
HK1101827A1 (en) 2007-10-26
DK1733042T3 (da) 2008-09-08
DE602005006770D1 (de) 2008-06-26
EP1733042A1 (en) 2006-12-20
SI1733042T1 (sl) 2008-10-31
WO2005098018A1 (en) 2005-10-20
BRPI0508808A (pt) 2007-08-07
ITMI20040717A1 (it) 2004-07-09
CN1946854A (zh) 2007-04-11
US20070238887A1 (en) 2007-10-11
ATE395429T1 (de) 2008-05-15

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